Red Sandstone
Arenic rock (composed mainly of SiO2 with Fe2O3)
sedimentary
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Primarily Composed Of Minerals) in the encyclopedia
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Unakite
Unakite (Epidotized Granite)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Black Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Tiger's Eye (Inlaid in a band)
SiO2 (Silicon Dioxide with Crocidolite inclusions)
mineral
Sandstone
Arenite or Sandstone
Sedimentary Rock
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Sandstone (Micaceous Sandstone)
Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)
sedimentary
Labradorite (White/Grey Labradorite)
Labradorite: (Ca, Na)(Al, Si)4O8
mineral
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Granite
Phaneritic Plutonic Felsic Rock
igneous
Hypersthene
Hypersthene (Magnesium Iron Silicate - (Mg,Fe)SiO3)
mineral
Limonite Concretion
Goethite/Limonite (FeO(OH)·nH2O)
sedimentary
Libyan Desert Glass
Tektite (high-silica impact glass), SiO2
mineral
Quartzite with Hematite
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Serpentine
Serpentine-group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4)
metamorphic
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Chrysocolla and Azurite in Matrix
Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Gneiss
Gneiss
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Granite River Pebble
Granite
igneous
Smoky Quartz
Quartz (Silicon Dioxide), Formula: SiO2
mineral
Agate
Silicon Dioxide (SiO2) - Chalcedony variant
mineral
Quartz / Calcite Vein Rock
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Quartz Vein (Iron-stained)
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Basalt
Basalt (Mafic Volcanic Rock)
igneous
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Orange Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
River Pebble (Graywacke/Sandstone)
Lithic Sandstone
sedimentary
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Garnet Schist
Almandine Garnet Schist
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Mineral, potentially a rock with chalcedony/jasper.
Peach Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with inclusions
mineral
Gemstone Sand (Mineral Assortment)
Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)
mineral